Machine for making bellows bags



Jan. 5, 1937. G. w. POPPE MACHINE FOR MAKING BELLOWS BAGS Filed June 21,1954 4 Sheets-Sheet l INVENTOR GIV/Pf h/ /0PP ATTORNEY Jan. 5, 1937. w,PQPPE 2,067,017

MACHINE FOR MAKING BELLOWS BAGS Filed June 21, 1934 4 Sheets-Sheet 2INVENTOR GZW/Ff h/ Pap/ 5 ATTORNEY Jan. 5, 1937. G. w. POPPE. 2,057,017

MACHINE FOR MAKING BELLOWS BAGS Filed June 21, 1954 4 Sheets-Sheet 3 .52I I INVENTOR 6f0fl6 Pa f ATTO R N EY Jan. 5, 1937. G. w. POPPE 2,067,017

MACHINE FOR MAKING BELLOWS BAGS Filed June 21, 1934 4 Sheets-Sheet 4INVENTOR afaif W/Q f Q BY ATTORNEY Patented Jan. 5, 1937 FOR G BELLGWSBAGS George W. lPonpe. Brooklyn, N. Y assignor to Equitable Paper Bag00., Inc... Brooklyn, N. Y., a corporation of New York Application June21, 1934, Serial No. 731,621

3 Claim.

This invention relates to a machine for making bellows bags and itsprimary object is to make a bellows bag having a step cut-off at thebottom thereof, which machine shall be simpler in construction andemploy less parts than mahcines for this purpose heretofore proposed.

Bellows bags made by cutting ofl sections from the folded web have longbeen in use and machines for making them have been highly developed. Theusual practice is to feed a web of paper under the former of a bagmachine, fold the bellows on top of the former and paste the free edgesof the web to form the upper or seam wall of the bag tube. The edge ofthe former is provided with teeth or serrations and the lower bag wallis severed by engagement with said serrations. Both bellows folds andthe upper or seam wall of the bag tube are severed by the lip knife. Inmaking a bag tube in this way three thicknesses of paper must be severedat one time by the lip knife. Where relatively light paper is used forthe bag tube this method may serve, but when relatively heavy paper isused the strain upon the lip knife is so great that a heavier type ofmachine must be employed.

The present invention contemplates the separate severing of the bellowsfold or at least one ply thereof and the bag walls. In the specificembodiment of the invention, the former about which aweb of paper iswrapped to form a bag 2, is modified and the wing plates which form thebellows folds are utilized to sever the bellows folds thereby relievingundue strain upon the lip knife.

The invention will be better understood in detail by reference to theaccompanying drawings in which:-

Figure 1 is a longitudinal section of an ordinary bag machine having oneform-of my improvements embodied therein;

Figure 2 is an enlarged sectional view of the former and associatedparts;

Figure 3 is a diagrammatic illustration of the manner of pasting thebottom of the bellows bag tube;

Figure 4 is a section on the line 4-4, Figure 1;

Figure 5 is a section similar to Figure 4 with some of the parts ofFigure 4 removed to better show underlying parts;

Figures 6, '7 and 8 are sections on the lines 66, 1-4 and 8--8,respectively, Figure 1;

Figure 9 is a view of a portion of a modified construction of theformer;

Figure 10 is a front view of Figure 9 looking in the direction of thearrow Ill;

Figure 11 is a section taken through the feed roller shafts and showingthe bag tube in side elevation to illustrate the manner in which the bagtube is fed in relation to the former;

Figure 12 is a view similar to Figure 11 but omitting some portions ofthe bag tube to better show 5 the construction of the former;

Figure 13 is a top plan view of a portion of the machine adjacent thefeed rollers showing a further modification, in which the wing plateswhich form the bellows folds are provided with serra- 10 tions to cutofi one ply of the bellows;

Figure 14 is a section on the line lit-M of Figure 13;

Figure 15 is a section on the line lE-lt of Figure 14 and Figure 16 is aperspective view of a bag tube section made on a machine like that shownin Figures 13 and 14.

Before describing my particular improvements, some reference to thegeneral construction of bag machines and the processes heretofore usedin making a bellows fold bag may be in order. Referring, therefore toFigure 1, the machine in general includes side frames 2 which support anumber of cross shafts whose function and mode 25 of operation will belater described.

A Web of paper E is fed from the roller 5 and after passing over guiderolls 6, l and 8 passes over a reversing roller I ll at which point aline of paste is supplied to the edge thereof by a paste 30 disc l2mounted on the shaft l3 and rotating in a paste pot it supported from anarm l5 extending rearwardly from one of the side frames 2. The web ofpaper then passes downwardly and under the heel of a. former l6supported centrally 35 from a post I8, which post depends from a crossbar 20 carried by forwardly extending arms 22 of the frame members 2.The web of paper passes under the former and is folded over onto it inthe usual and well-known manner and the bellows 4.0 folds are made in itby the wing plates 24, better, shown in Figures 4 and 5. These platesform the bellows folds in the usual manner and the free edges of the webare overlapped and pasted as indicated in Figure 3. The bellows tubethus formed 45 passes under feed rollers 26 and thence to the usualpinch bars 28 which momentarily retard the tube to permit severance ofthe same by the striker bar 30 carried by a sprocket chain 3i passingover upper and lower sprockets 32.

All of the parts so far described are found in a usual bag machinedesigned for producing a bellows folded bag tube.

It has heretofore been proposed to sever the bag walls and the bellowsfolds by separate cut-, 55

ting means, thereby producing what may be called a step cut-off. Inmaking the step cut-oil, the line of severance of both plies of thebellows fold may be oif-set from the seam wall of the bag or one ply ofthe bellows. fold may be severed along the line which is off-set fromthe line of severance of the seam wall, the other ply being severedalong the line substantially coincident with the line of severance ofthe seam wall.

Figure 3 serves to illustrate both variations. The upper or seam wall'is severed along the line I3. The line of severance of the bellows foldsis indicated at 34 and at least one ply of these folds is severed alongthis line and both plies may be so severed. The lower bag wall issevered along the line 35.

By the usual mechanism the bottom of the bag is folded along the linea--a, Figure 3, but the manner of pasting is different from thatemployed in an ordinary bellows bag. Lines of paste indicated at 38 and31, Figure 3, are applied to the seam wall of the bag and when thebottom is folded along the line (1-0., one ply of the bellows folds ispasted along the paste line 36 while the lower bag wall is pasted alongthe line 31. This insures a very tightly pasted bag bottom.

Referring to Figure 2, the lip knife 34 is supported by a cross bar I!which lip knife serves to sever the upper or seam wall only of the bagtube but does not sever either ply of the bellows folds.

' In the construction shown in Figure 2 I provide a plate 42 spaced fromthe former by a wedgeshaped central rib 44 as shown in Figure 4. Thisplate 42 extends a slight distance beyond the edge of the lip knife andabove the wings 24 which form the bellows. The bellows folds thereforeare formed beneath the plate 42 but over the former 16. The latter isprovided with the usuafser- ;rated edge 46 and the plate 42 is likewiseproshown in Figure 4, the serrated edge 48 of the plate 42 may have itsserrations extending inwardlya distance from the edge thereof equal onlyto the width of the bellows fold, although a continuous edge may beemployed.

In order that the feed rollers 2| may properly engage the bellows foldedbag tube the former I. and the plate 42 are bothcut away or recessed asshown at 50, Figure 5. Referring again to Figure 2, the lower wall ofthe bag is underneath the former, the bellows folds thereof are betweenthe former and the plate 42 and the bellows folds of the bag are on topof the plate 42. Therefore, when the striker bar 30 delivers a blow tothe under side of the bag tube the lower wall thereof is severed alongthe line 35 by the serrated edge 46 of the former and both plies of thebellows folds are severed along the line 34 by the serrated edge of theblade 42. The lip knife 3! severs the upper or seam wall of the bagalong the line 33.

In the construction shown in Figures 9 to 12, inclusive, the lines ofseverance are the same as in the construction previously described.

In this construction, however, the former its is cut away more deeply at50a, for a purpose which will presently appear, and the bellows foldsare severed against the serrated edge or edges 46:: thereof. Forsevering the lower wall of the bag tube, a separate plate 52 isadjustably secured beneath the former and spaced therefrom a suitabledistance to permit the bellows folds to pass between it and the former.Bpacing collars It are shown in Figure 10 and slots in the former or theplate I2 provide for adjustment of the plate relative to the former. Thebellows folds are made by the wings 24 on top of the former but afterthe bellows has been formed the bellows folds are fed underneath theformer and between it and the plate 52 as shown-in Figures 11 and 12.The lower wall of the bag is severed by the edge of the plate 52 andboth plies of the bellows folds are severed by the former, the upperwall of the bag only being severed by the lip knife.

The deep recesses Ella in the former are formed in the manner shown topermit the bellows folds, which are above the former during the foldingoperation, to pass beneath the former prior to the cut-off operation.

Referring to Figure 13, the former lib is provided as usual with aserrated edge 48b and the feed rollers 26 are set on their respectiveshafts so that they are inside of the bellows folds. In thisconstruction, theedge 48b of the former severs the lower bag wall butone ply of the bellows folds is severed by the wing plates 24a. Toenable them to do this they are provided with serrated edges 54, Figure13, which are of a width sumcient to properly sever one ply of thebellows folds, the lip knife severing the other ply thereof and also thetop or seam wall of the bag tube.

The wing plates 24:: are supported from the side frames 2 by right anglebrackets 56, Figures 14 and 15, and are slotted as indicated at 51,Figure 15, to permit longitudinal adjustment of the plates 24a tothereby vary the amount of offset of the cut-off affected by theseplates. The plates are adjustable laterally in the usual manner, suchadjustment being provided by slotting the plates as indicated at I! andproviding a hand-operated screw it engaging a thread tapped in thebracket for holding them in adjusted position. Two of these adjustingdevices are provided on each side of the machine as indicated in Figure4.

Figure 16 shows in perspective the bottom of a bag tube severed by meansof the mechanism described in Figures 13 and'14. To complete the bag,the bottom is folded along the line M and the bottom flap is pastedalong the paste line 31 while the lower ply of the bellows folds ispasted along the paste line 3|.

The paste lines 38 and I! are applied to the seam wall of the bag tubeby a paste bar ll carried by a cylinder 62 which cylinder also carriesthe tucker blade 3 which tucks in the bottom of the bag. The tuckerblade 63 c0- operates as usual with a lower cylinder 64 which carriestheusual clamp. The mechanism for tucking in and pasting the bottom differsfrom the usual mechanism commonly found in bag machines only in the factthat the paste bar III is provided with two paste applying ribs 65instead of one such rib as is customary. The paste is supplied as usualfrom a paste pct 86 from which projects a roller OI. At every rotationof the cylinder 02 the paste bar 60 wipes against the roller 68 andtakes off the necessary amount of paste to be applied to the bag tubewall. The bag, after passing the cylinder 62 and 64 is fed to deliverymechanism of the usual kind.

By reason of the adjustment provided by the slots 51, the amount thatthe line of severance 34 may be offset from the line of severance 35 maybe varied. The lip knife may also be adjusted in the manner usual in bagmachines,

being slotted at 61 for this purpose so as to vary the distance betweenthe line of severance 33 and the other two lines of severance.

when the difference between the lines of severance is slight, the edgeof the tube between the lines of severance is usually torn but for mostbags this is not objectionable. However, in order to provide suflicientroom to paste the bellows folds securely to the bag bottom, it may bedesirable to make the oifset between the lines of severance 33 and 34 solarge that the tear at the edge of the tube becomes objectionable. Thisdifliculty may be readily overcome, however, by utilizing theweb-cutting mechanism disclosed in my Patent 1,798,163, Figure 2.Preferably, slitter knives similar to those shown at 12, Figure 2 ofsaid patent, may be utilized and these may be mounted on the shaft'll,Figure 1. This shaft corresponds to the shaft 52 shown in saidpatent. It may be driven as shown in said patent from the lower pinchbar shaft 12. Since this mechanism is fully shown in said patent andalso fully described therein, it is thought that it will be unnecessaryto show the same in detail in the present application. For the purposeof making the present disclosure as complete as possible, however, itmay be stated that the shaft 12 carries a suitable sprocket for drivinga sprocket chain H, which chain passes about a sprocket 16 carried byshaft II. Shaft I8 carries a gear indicated in dotted lines I! whichmeshes with a similar gear 30 carried by a shaft 32. Shaft 82 carries asprocket whichdrives a sprocket chain 84 which passes over a sprocketcarried by the shaft 10. Sprocket chain 34 corresponds to the,

sprocket chain 35, Figure 2 of my said patent. By means of the slitterknives indicated at I,

Figure 1, the web may be provided with short slits x, :c and Figure 3,which are so located that when the tube is severed along the lines 33,34 and 35, the slits a: will be located at the bag tube edges betweenthe lines of severance 34 and 35 and the slits y will be located betweenthe lines of severance-33 and 34.

What I claim is:

1. In a bag machine. the combination with a former about which a web ofpaper is adapted to be wrapped to form a bellows bag tube, wing platesadapted to engage-the tube and to form bellows folds'therein, one edgeof each wing plate having cutting edges for severing one ply of thebellows fold.

2. In a bag machine, the combination with a former about which a web ofpaper is adapted to be wrapped to form a bag tube, of wing plateslocated adjacent the former and cooperating with the former to producebellows folds in the bag tube, said wing plates having serrated cuttingedges for severing one ply of the bellows fold, and said former having aserrated edge for severing one wall of the bag tube.

3. In a bag machine, the combination with a former about which a web ofpaper is adapted to be wrapped to form a bag tube, of wing plateslocated adjacent the former and so shaped as to produce bellows folds insaid tube, said former having a serrated edge for severing one wall ofthe bag tube, said wing plates having cutting edges for severing one plyof the bellows folds, and a lip knife having a cutting edge for severingthe other ply of the bellows folds and the other wall of the bag tube.

GEORGE w. POPPE.

